- Author: Rachael Freeman Long
- Author: Ian Grettenberger
Painted lady butterflies (Vanessa cardui) are dazzling us with color, but surprising us with sporadic finds of caterpillars on crops this year, including alfalfa, pistachio, walnuts, artichokes, and hybrid sunflower (see IPM Advisor Emily Symmes blog: What's that Caterpillar on my Weeds?).
Painted lady caterpillars primarily feed on weedy hosts such as Malva (cheeseweed), plantago, cocklebur, star thistle, and some legumes, especially lupines, but NOT alfalfa or close relatives. They do not breed on alfalfa or tree crops, so while one may find larvae in these crops, they should not cause any...
As you're thinking about winter weed management in alfalfa production, keep in mind the need for common groundsel control.
Groundsel (Senecio vulgaris) is highly toxic to livestock at all growth stages because it contains pyrrolizidine alkaloids (PA) which can cause chronic and irreversible liver disease in animals. Cattle and horses are most sensitive to the PAs, followed by pigs and chickens, and then sheep, goats and turkeys, which are the least sensitive to PA toxicity. Younger animals are typically more sensitive than adults. Therefore, the identification and control of groundsel in forages is important for preventing livestock PA poisonings.
- Author: Nicholas Clark
This year's Alfalfa and Forage Field Day held on September 19, 2018 at the Kearney Agricultural Research and Extension Center in Parlier, CA, was another success.
The presentations and handouts from that day are now available on the University of CA Alfalfa and Forages website. Click here to reach the page where you can download individual presentation slides and handouts.
ABOUT THE EVENT
Industry sponsorship of this event reached an outstanding level, and the meeting will be funded for another year without the need to reach out to...
- Author: Nicholas Clark
The agenda for the annual Kearney Alfalfa and Forage Field Day is set.
Where: Kearney Agricultural Research and Extension Center; 9240 S. Riverbend Ave.; Parlier, CA 93648
When: Wednesday, September 19, 2018 @ 7:30 AM - 12:15 PM
What: A half day of field tours, hands on demonstrations, and classroom presentations from UC Farm Advisors and Specialists as well as industry professionals. Refreshments and lunch are provided.
1.5 "Other" DPR units have been applied for. 0.5 NM, 1.0 SWM, 1.5 IPM,...
The old saying, “Everything's fine until it's not,” comes to mind when dealing with some tough to control perennial weeds in alfalfa production during the summertime. Such was the case for an alfalfa field in the Sacramento Valley, where weed control seemed good up until mid-summer, and then it wasn't. Perennial weeds that started off small and overlooked, grew through the season, persisting through multiple cuttings, including curly dock, plantain, and nutsedge. For tough to control weeds in alfalfa fields, one needs to determine: 1) What types of perennial weeds are present, and 2) How many of them are there, to make a decision on how to manage them. These sorts of weed issues can creep up quickly in older alfalfa...